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Tug Harder!

Age 7 to 11
Challenge Level
A group of children from Brampton Primary School in Suffolk sent the following suggestions for how to change the game:

Using all four operations but extending the number line to +40 and -40 and using a dice from 1-10
Playing the game with one dice but always multiplying the number on the dice by 2
Playing the game with  two 1-6 dice and all four operations but having to decide on the operation you are going to use before you roll.

Thank you!  I wonder whether you tried out your suggestions to check that they worked well?